I'm not sure what you're getting at. If everyone expected electric vehicles to just naturally replace all petrol powered vehicles and make them extinct, there would be no need for talk of a ban. Of course petrol heads will always want petrol powered vehicles. The whole point of bans is to stop people doing things they would otherwise do.

Note I'm not advocating a ban as such. I think it would be a shame if all petrol powered vehicles were banned, if only for historical appreciation. They might be banned from or face restrictions on their use on public highways though. However it does seem likely there will be a push back from petrol heads on that.